package com.leo.auth.filter;

import lombok.AllArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;
import java.util.logging.LogRecord;

/**
 * <p>
 * 自定义权限拦截器
 * </p>
 *
 * @author ：Leo
 * @since ：2021-04-09 9:25
 */
@Component
@AllArgsConstructor
public class CustomSecurityInterceptor extends AbstractSecurityInterceptor implements Filter {
    private final FilterInvocationSecurityMetadataSource securityMetadataSource;

    @Autowired
    public void setMyAccessDecisionManager(CustomAccessDecisionManager accessDecisionManager) {
        super.setAccessDecisionManager(accessDecisionManager);
    }

    @Override
    public Class<?> getSecureObjectClass() {
        return FilterInvocation.class;
    }

    @Override
    public SecurityMetadataSource obtainSecurityMetadataSource() {
        return this.securityMetadataSource;
    }


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        FilterInvocation filterInvocation = new FilterInvocation(servletRequest, servletResponse, filterChain);
        invoke(filterInvocation);
    }

    private void invoke(FilterInvocation filterInvocation) throws IOException, ServletException {
        //filterInvocation里面有一个被拦截的url
        //里面调用CustomFilterInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取filterInvocation对应的所有权限
        //再调用CustomAccessDecisionManager的decide方法来校验用户的权限是否足够
        InterceptorStatusToken token = super.beforeInvocation(filterInvocation);
        try {
            //执行下一个拦截器
            filterInvocation.getChain().doFilter(filterInvocation.getRequest(), filterInvocation.getResponse());
        } finally {
            super.afterInvocation(token, null);
        }
    }
}
